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\section{Discussion}

The approach that was described in this paper can be easily extended to larger scales. For example, at the European level, the review of volume and biomass equations made by \cite{zianis2005} could be used for constructing the groups. At the world level, the GlobAllomeTree project \citep{henry2013} that proposes a catalog of tree allometric equations for volume and biomass estimations could be used.



